hacktoberfest2020/Subsequence at master · samkitjain4916/hacktoberfest2020 · GitHub

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#include <cmath>
#include <cstdio>
#include <stack>
#include <iostream>
#include <bits/stdc++.h>
using namespace std;


int main() {

    int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin>>n;
        string s;
        cin>>s;
      map<char,int> m;
        for(int i=1;i<=n;i++)
        {
            if(s[i]!=s[i-1])
            m[s[i-1]]++;
            else if(s[i]==s[i-1])
            {
                m[s[i]]++;
                i++;
            }

}
           int flag=0;


        for(auto i=m.begin();i!=m.end();i++)
        {
if(i->second>=2)
{
    cout<<"YES"<<endl;
    flag=1;
    break;
}
            }
        if(flag==0)
            cout<<"NO"<<endl;

}

    return 0;
}